Description of problem:
I was reading e-mail when suddenly Evolution's status bar exploded with a large number of tasks. The application then became unresponsive and I had to kill it with "evolution --force-shutdown".

Version-Release number of selected component:
evolution-3.6.2-3.fc18

Additional info:
backtrace_rating: 4
cmdline:        evolution
crash_function: save_tree_state
executable:     /usr/bin/evolution
kernel:         3.6.11-3.fc18.x86_64
remote_result:  NOTFOUND
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 save_tree_state at message-list.c:2125
 #1 message_list_save_state at message-list.c:2159
 #2 mail_shell_view_prepare_for_quit_cb at e-mail-shell-view-private.c:585
 #7 shell_prepare_for_quit at e-shell.c:447
 #9 e_shell_quit at e-shell.c:1902
 #10 msg_composer_delete_event_cb at e-msg-composer.c:1784
 #11 _gtk_marshal_BOOLEAN__BOXED at gtkmarshalers.c:85
 #16 gtk_widget_event_internal at gtkwidget.c:6301
 #17 gtk_widget_event at gtkwidget.c:5958
 #18 gtk_main_do_event at gtkmain.c:1600